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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jul. 28, 2012	Apr. 28, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Unrealized loss on marketable securities arising during the period, tax	$ 0.1	$ 0
Reclassification adjustment for gain on marketable securities included in net income, tax	0.1	0.2
Change in fair value of cash flow hedge, tax	0
Net pension amortization and net actuarial loss, tax	$ 0.3	$ 7.5

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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- Definition

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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